My passion project is going good so far my first experiment worked ( i will post pictures of that latter) and my chicken bone project is working pretty good. My Hypothesis is that the vinegar will take out the Calcium in the bone and make it rubbery. the bone is starting to look weird. If any of you want to try this at home all u need is a raw chicken bone and vinegar. first put the chicken bone in the bowl then poor in the vinegar and let it set for one or two weeks.